1. Sichuan Key Laboratory of Medical Imaging, and Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China.
2. Department of Radiology, Sichuan Cancer Hospital and Institute (The Second People's Hospital of Sichuan Province), Chengdu, Sichuan, China.
3. Department of Radiology, West China Hospital of Sichuan University, Chengdu, Sichuan, China.
4. Department of Radiology, University of Michigan Health System, Ann Arbor, MI, USA.